Bank teller machines rely on using information on the user’s card giving the bank identifier, the account number and the user’s personal identifier. They also derive account information from a central database and update that database on completion of a transaction. Using your knowledge of ATM operation, write Z schemas defining the state of the system, card validation (where the user’s identifier is checked) and cash withdrawal.
What will be an ideal response?
The Z schemas are shown below. There are many different possibilities here
depending on how much information is maintained. This is one of the simplest
which assumes that customers may not withdraw money if there is an insufficient
cleared balance in their account (a cleared balance is where all cheques paid into
cleared balance is where all cheques paid in to the account have been cleared for
payment).
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What will be an ideal response?